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arxiv: 2606.06553 · v1 · pith:LMBPFQUJnew · submitted 2026-06-04 · ⚛️ physics.ins-det · hep-ex· hep-ph· hep-th· nucl-ex· nucl-th

Hyperon-Nucleon Spectrometer

Xiaozhi Bai , Xu Cao , Zhe Cao , Jinhui Chen , Kai Chen , Qibo Chen , Shi Chen , Xin Chen
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Yuquan Chen Zhenyu Chen Jianping Dai Heng-Tong Ding Dongshuo Du Shuxian Du Limin Duan Zhe Duan Anhui Feng Jie Feng Yicheng Feng Jinlin Fu Xiaofeng Fu Chaosong Gao Liang Ge Wenwen Ge Lisheng Geng Boxing Gou An Gu Yinghui Guan Yutian Guan Aiqiang Guo Fengkun Guo Lu Guo Hao Han Weijia Han Yunxiang Hao Wanbing He Xionghong He Zhixuan He Defu Hou Tingting Hou Jinniu Hu Shouyang Hu Zhen Hu Fei Huang Kaixuan Huang Linqin Huang Mei Huang Xuguang Huang Yuanjing Ji Xincai Kang Jie Kong Cheng Li Demin Li Haibo Li Jibo Li Lixuan Li Min Li Peilian Li Peiyu Li Ronghua Li Suxian Li Weilong Li Wuyuan Li Xin Li Xiaomei Li Xiaqing Li Yang Li Yangu Li Yutie Liang Zheng Liang Zuotang Liang Chuangxin Lin Dexu Lin Shoulong Lin Ting Lin Bo Liu Bo-Chao Liu Feng Liu Hang Liu Hongna Liu Hui Liu Kai Liu Liuming Liu Qian Liu Tianbo Liu Tong Liu Xiang Liu Yanwen Liu Pengzhong Lu Weijian Lu Xiaofeng Luo Xiao-Rui Lyu Bo-Qiang Ma Jianping Ma Kuo Ma Weihu Ma Yugang Ma Lijun Mao Ruishi Mao Yu Meng Norihito Muramatsu Maowu Nie Xiaoyang Niu Hua Pei Ronggang Ping Shi Pu Tianlei Pu Cheng Qian Wenbin Qian Yi Qian Guangyou Qin Jiajun Qin Cong-Feng Qiao Zan Ren Dingyu Shao Qianshun She Diyu Shen Guodong Shen Wenhan Shen Xiaomin Shen Lina Sheng Shusu Shi Jinxing Song Qintao Song Yuan Song Zihe Su Baohua Sun Hao Sun Kai-Jia Sun Liangting Sun Peng Sun Pengfei Sun Xiangming Sun Xu Sun Yelei Sun Zhipeng Sun Zhiyu Sun Shuwen Tang Zebo Tang Jing Tian Ye Tian Yu Tian Yapeng Wan Boqun Wang Changxin Wang En Wang Enke Wang Haozhen Wang Hulin Wang Jiansong Wang Ling Wang Qun Wang Tianao Wang Xiangang Wang Xiang-Peng Wang Xiaoyu Wang Xinyu Wang Xiongfei Wang Xiuhua Wang Yaping Wang Shuyi Wei Xianglun Wei Xiangjie Wen Fengjun Wu Jia-jun Wu Xin Wu Bowen Xiao Le Xiao Zhigang Xiao Guannan Xie Yaping Xie Hongxi Xing Weizhi Xiong Ji Xu Lailin Xu Nu Xu Qinghua Xu Xiaowei Xu Junwei Yan Wenbiao Yan Wencheng Yan Xiaoyu Yan Bo Yang Chi Yang Haibo Yang Herun Yang Jiancheng Yang Qian Yang Shuai Yang Tongjun Yang Yadong Yang Yuansheng Yang Yuna Yang Zaochen Ye Zhihong Ye Li Yi Hang Yin Junhao Yin Yi Yin Kejie You Zhengyun You Chunxu Yu Yuhong Yu Zhaoyang Yuan Wangmei Zha Honglin Zhang Jianyu Zhang Jin Zhang Jinlong Zhang Jinqun Zhang Shisheng Zhang Weibin Zhang Xiang Zhang Xueheng Zhang Yapeng Zhang Yateng Zhang Yifei Zhang Yumei Zhang Yuqiao Zhang Zhe Zhang He Zhao Hongyun Zhao Lei Zhao Yuxiang Zhao Zhengguo Zhao Yajun Zheng Yangheng Zheng Zhiyang Zheng Daicui Zhou Jian Zhou Jiangpeng Zhou Jing Zhou Kai Zhou Xianrong Zhou Xiaorong Zhou Yiyu Zhou Sitao Zhu Xiao Zhuang Xinyu Zong Bingsong Zou
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classification ⚛️ physics.ins-det hep-exhep-phhep-thnucl-exnucl-th
keywords polarizationwillhiafcollisionsenergyh-nsprotonspectrometer
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Chirality lies at the heart of low-energy QCD, governing the symmetry structure that shapes hadron masses and strong interaction dynamics. Among the most compelling open questions tied to chiral dynamics and spontaneous chiral symmetry breaking is the longstanding $\Lambda$ polarization puzzle, in which $\Lambda$ hyperons produced in unpolarized hadronic collisions exhibit a surprisingly large transverse polarization that remains theoretically unexplained. This whitepaper presents the proposal for the Hyperon-Nucleon Spectrometer (H-NS) at the High-Intensity heavy-ion Accelerator Facility (HIAF). Leveraging the high energy and high intensity of HIAF's proton and heavy-ion beams, the H-NS experiment will perform systematic studies of hyperon polarization phenomena and their underlying mechanisms in proton-proton ($pp$), proton-nucleus ($pA$), and nucleus-nucleus ($AA$) collisions in the fixed target mode. A wide-range beam energy scan, including proton beams from 3 GeV up to 9.3 GeV (HIAF) and up to 32 GeV (upgraded HIAF), will be conducted to examine the dependence of polarization on collision energy. The spectrometer is designed with specialized detectors capable of high-precision reconstruction of final-state baryon polarizations. Among its many interesting and important measurements, H-NS will simultaneously measure hyperon and proton spin observables to explore the polarization mechanism in hadronic interactions and the spin structure of baryons. Furthermore, the use of $pA$ and $AA$ collisions will enable detailed investigations of cold and hot nuclear matter effects on spin polarization. Its physics program and detector development will significantly benefit the future Electron-ion Collider in China.

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